LCD freezing problem with interrupts

[pxidr84]

OSC is defined as 40Mhz, where is the config settings?
which pic is this?

A special PIC for motor control, it's the PIC18F4431, 10MHz quartz with PLL enabled (so 4*10=40MHz).

[sayzer]

So, while LCDOUT command is being executed, an interrupt is occuring.

To "test" this, you can disable all interrupts before lcdout command and enable them right after.
This is just to see.
But this will definitely effect your motor. It can give you a point anyway.